On 4/11/12 5:54 PM, Charles Pritchard wrote:
>> Note that those have different performance characteristics, too; the
>> latter involves a buffer copy.
>
> Are we stuck with a buffer copy (or copy on write) mechanism anyway?
Yes-ish; the question is how many copies there are.
> What is the spec on changing the buffer after xhr.send?
http://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#the-send%28%29-method
says that the request body is the data in the array buffer when send()
is called.
Whether that involves a copy depend on whether you get the data down to
the socket before send() returns, obviously. In most cases, I would
assume it would.
Having so slice() means you have to copy twice instead of once.
-Boris